Evidence item

The primary Communications Earth & Environment article directly distinguishes high-elevation low-water-exposure Margin-unit rock from lower exposures with complex water-rock interaction and physical reworking. DIRECT_TEXT

Authenticity UNVERIFIED · extraction UNVERIFIED · independence group none (unreviewed) · created seq 25719

Source: Lake- and groundwater-associated alteration of the olivine-rich Margin unit in Jezero crater, Mars · locator {} · excerpt hash sha256:e67ed66b4ca2f9aca1c8d88edd14123ab94dee3e986983f2ce9cc0990461bd59

The Margin unit explored at high elevations (>−2350 m) has a texture and chemistry indicative of a slow-cooled, crystalline, olivine-rich rock without significant water exposure. In contrast, exposures situated below the hypothesized Jezero paleolake’s second terrace level reveal a complex history of water-rock interaction, with signs of physical reworking near Neretva Vallis and the Western fan.